RT9703CS RICHTEK [Richtek Technology Corporation], RT9703CS Datasheet

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RT9703CS

Manufacturer Part Number
RT9703CS
Description
80m?, 3A Smart Universal Power Switch with Flag
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet
General Description
The RT9703 is a low voltage, high performance single
N-Channel MOSFET power switch, designed for power
rail on/off control with low R
protection functions. The RT9703 equipped with a charge
pump circuitry to drive the internal MOSFET switch and a
flag output is available to indicate fault conditions against
large di/dt which may cause the supply to fall out of
regulation. In order to fit different application, an IP pin is
offered for current limit point setting, a resistor from IP to
ground sets the current limit for the switch.
Additional features include soft-start to limit inrush current
during plug-in, thermal shutdown to prevent catastrophic
switch failure from high-current loads, under-voltage
lockout (UVLO) to ensure that the device remains off
unless there is a valid input voltage present, a precision
resistor-programmable output current limit up to 3.5A.
Besides, the lower quiescent current as 30 A making this
device ideal for portable battery-operated equipment.
The RT9703 is available in SOP-8 package requiring
minimum board space and smallest components.
Ordering Information
DS9703-00 September 2003
RT9703
Operating Temperature Range
C : Commercial Standard
Package Type
S : SOP-8
80m , 3A Smart Universal Power Switch with Flag
DS(ON)
dd
80m
and full
Preliminary
1
Features
Applications
Pin Configurations
Adjustable Current Limiting Up To 3.5A
Built-In (Typically 80m ) N-Channel MOSFET
Reverse Current Flow Blocking (no body diode) i.e.
Output Can Be Forced Higher Than Input (Off-State)
Low Supply Current:
30 A Typical at Switch On State
Less Than 1 A Typical at Switch Off State
Guaranteed 3A Continuous Load Current
Wide Input Voltage Ranges: 2V to 5.5V
Open-Drain Fault Flag Output
Hot Plug-In Application (Soft-Start)
1.7V Typical Under-Voltage Lockout (UVLO)
Thermal Shutdown Protection
Smallest SOP-8 Package Minimizes Board Space
LCD Monitor, LCD-TV
USB Power Module for ADSL
Information Appliance and Set-Top Box
Battery-Powered Equipment
Hot-Plug Power Supplies
ACPI Power Distribution
PCI Bus Power Switching
Motherboard & Notebook PCs
PC Card Hot Swap Application
VOUT
VOUT
GND
FLG
(TOP VIEW)
2
3
4
SOP-8
8
7
6
5
IP
VIN
VIN
CE
RT9703

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RT9703CS Summary of contents

Page 1

Smart Universal Power Switch with Flag General Description The RT9703 is a low voltage, high performance single N-Channel MOSFET power switch, designed for power rail on/off control with low R protection functions. The RT9703 equipped with a ...

Page 2

RT9703 Typical Application Circuit Supply Voltage Functional Pin Description Pin Name Pin Function VIN Supply Input VOUT Switch Output GND Common Ground CE Chip Enable Control Input FLG Open-Drain Fault Flag Output IP Current Limit Programming Input Function Block Diagram ...

Page 3

Test Circuits SUPPLY V A VIN FLG RT9703 VOUT CE ON GND OFF DS(ON) V VOUT VIN C IN RT9703 V IN FLG CE IP GND 5 V Note: Above ...

Page 4

RT9703 Absolute Maximum Ratings Supply Voltage --------------------------------------------------------------------------------------------------------- 6.5V Chip Enable Input Voltage ------------------------------------------------------------------------------------------ 0.3V to 6.5V Flag Voltage ------------------------------------------------------------------------------------------------------------ 6.5V Power Dissipation 25° SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.95W Package Thermal Resistance SOP-8, -------------------------------------------------------------------------------------------------------------- 104° C/W JA ...

Page 5

Parameter Thermal Shutdown Protection Thermal Shutdown Hysteresis Note 1. Stresses beyond those listed under These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the ...

Page 6

RT9703 Typical Operating Characteristics 2 On-State Supply Current vs. Input Voltage 10uF Open 100k SET 1.5 2 2.5 3 ...

Page 7

Current Limit OFF 3 2.5 2 1 100 150 200 250 300 SET 3 On-Resistance vs. Input Voltage ...

Page 8

RT9703 4 CE Threshold Voltage vs. Input Voltage 2 10uF 33uF IN OUT I = 100mA 100k L SET 2 1.6 1.2 0.8 0 2.5 3 3.5 Input Voltage (V) Turn-On Rising ...

Page 9

Flag Delay Time vs. Temperature 10uF 33uF IN OUT 0 100k L SET ...

Page 10

RT9703 FLAG Response (Enable into Current Limit FLG I L (1A/Div) Time (1ms/Div) 5 Current Limit with Thermal Shutdown 10uF 33uF OUT (1A/Div) ...

Page 11

Applications Information The RT9703 is a high-side, N-Channel, power switch available with active-high enable input. Low R 80m and full protection functions make it optimized to replace complex discrete on/off control circuitry. Input and Output V (input) is the power ...

Page 12

RT9703 The normal current limit value, I LIMIT resistor between IP (pin 8) and GND (pin 4). When a heavy load or short circuit is applied to an enabled switch, a large transient current may flow until the current limit ...

Page 13

Fault Flag Filtering (Optional) The transient inrush current to downstream capacitance may cause a short-duration error flag, which may cause erroneous over-current reporting. A simple 1ms RC low- pass filter (10k and 0 the flag line eliminates short-duration ...

Page 14

RT9703 Outline Dimension Symbol RICHTEK TECHNOLOGY CORP. Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Preliminary Dimensions ...

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